Created by: Timer
I want to expand on this more in the future, e.g. load site up in headless chrome/JSDom and add output matching.
For now, this makes sure our babel runtime work-around works.
Follow up to #5142.
Example failure before addition of #5142: https://travis-ci.org/Timer/create-react-app/builds/434316343#L1577-L1606
I'd add this to AppVeyor, but I'm thinking we should switch to Azure Pipelines and wait until then.